Ampoule syringe



Feb. 14, 1950 A. E. SMITH Y 2,497,563

AMPOULE SYRINGE Filed Aug. 4, 1947 55 J7 .lv /ff fz INVENT OR.

3 inner end oi the needle and the contents of the ampule.

The injection is then made and the ampule Il is moved slightly towards the front member 33, causing a slight injection of the contents of the ampule. Thereupon the ampule is withdrawn slightly relative to the plunger and if the needle has pierced a blood vessel the appearance of blood within the ampule will indicate such fact, whereupon the operator may withdraw the needle and make a fresh injection. When the needle is satisfactorily placed, the contents may be discharged by moving the ampule along the piston.

In Fig. 6 I show a modication of my invention. In this ligure parts similar to those previously described are designated by primed reference numerals. In the modiiication the reduced portion I9' of the plunger is provided with a pair of spaced shoulders 50 and `5|. The inner end of the plunger extends beyond the shoulder 5 I. The ampule `Il has an integral hemispherical closure 52 at one end. The inner end of the piston stopper 30 is rounded as at 53 to substantially agree with the rounded portion at the end 52 of the ampule. As a result, when the piston is fully moved into the -ampule the rounded portions will be in substantial engagement so that the amount of liquid remaining in the -ampule when the plunger is moved into its full in position will be small.

Having thus described my invention, I claim:

1. A syringe including a tubular ampule, a closure for one end of the ampule, a plunger movable in the ampule, said plunger having 4a bore therethrough and having a reduced inner porbore, a front member on said plunger, said front member having a, bore therethrough, a hypodermic needle having a pointed inner end and slidably extending through said front member bore and into the outer recess of said stopper, the

pointed end of said needle terminating short of piercing the stopper diaphragm, said needle having a protuberance thereon and having an injecting point in advance of the protuberance.

2. A syringe including a tubular ampule, an

integral rounded closure for one end of the ampule, a plunger in thev ampule, said plunger having a bore therethrough and having a reduced portion, said reduced portion terminating in a shoulder, a piston stopper on said reduced portion and engaging said shoulder, the inner end of said piston stopper being rounded to correspond to the shape of the adjacent end of the ampule, the outer end of said plunger having a recess communicating with the plunger bore, a stopper in said recess, said stopper having inner and outer aligned recesses, a diaphragm between said stopper recesses, said inner stopper recess communicating with said plunger bore, a front member on said plunger, said front member having a bore therethrough, a 'hypodermic needle having a pointed inner end vand slidably extending through said front member bore and into the outer recesses of said stopper, the pointed end of said needle terminating short of piercing the stopper diaphragm, said needle having a protuberance thereon and having an injecting point in advance of the protuberance.

3. A syringe including a tubular ampule, a closure for one end of the ampule, a plunger slidable in the other end of the ampule, said plunger having a bore therethrough, closure means including a pierceable diaphragm, said closure means being mounted on and movable with said plunger, said closure means closing the outer end of said plunger bore, and a hypodermic needle slidably mounted on said plunger, said hypodermic needle having a pointed inner end slidable to pierce the diaphragm.

4. A syringe including a tubular ampule, a closure for one end of the ampule, a, plunger slidable in the other end of the ampule, said plunger having a bore therethrough, said plunger having a piston stopper thereon, the outer end of said plunger having an enlarged recess communicating with the plunger bore, an imperforate stopper in said recess, a front member on said plunger, and a hypodermic needle having a pointed inner end and slidably extending through said front Amember and adapted to pierce the stopper to establish communication between the needle and the ampule contents.

5. A syringe including a tubular ampule, a closure for one end ci the ampule, a plunger movable in the ampule, a, piston stopper von the inner end of said plunger, the outer end of said plunger having a recess -communicating with the plunger bore, a stopper in said recess, said stopper having inner and outer l aligned recesses, a diaphragm between said stopper recesses, said inner stopper recess communicating with said plunger bore, a front member on said plunger, said front member having a bore therethrough, a hypodermic needle having a pointed inner end and slidably extending through Said front member bore and into the outer recess of said stopper, the pointed inner end of said needle terminating short vof piercing the stopper diaphragm, said needle having a protuberance thereon and having an injecting point in advance of the protuberance.

ARTHUR E. SMITH.

REFERENCES CITED The following references are of record in the file of this patent: i

UNITED STATES PATENTS Number 

